In this talk we introduce the still-developing color_ordering branch of MadGraph5_amc@NLO. This branch uses Berends-Giele recursions to calculate the matrix element, leading to more compact kinematics calculations. Additionally, this branch allows one to calculate matrix elements to a given order in the 1/Nc colour expansion in the trace basis. In this talk, we give an overview of the status of the branch, describe the physics of the colour expansion, show the results of this approximation, and show some speed comparisons with standard MadGraph.
Olivier Mattelaer (UCLouvain)